Div1 div4 – Impulse 3420 User Manual
Page 9
Card
Setup
Sealevel Systems COMM+8 Page
6
Set all jumpers to “S” if you are using more than one COMM+8 in a bus
or you wish to completely remove the pull-down resistor for hardware
compatibility. Setting the COMM+8 in this configuration when it is not
accompanied by a pull-down resistor will prevent the ports from
triggering an interrupt.
1
2
3
4
5
6
7
8
N S M N S M
E9
E10
Figure 6 - Header E9 and E10, Sharing IRQs with another adapter
Clock Modes
The COMM+8 employs a unique clocking option that allows the user to
select from divide by 4 or divide by 1 clocking modes. This mode is
selected at E12.
To select the Baud rates commonly associated with COM: ports (i.e. 2400,
4800, 9600, 19.2, … 115.2K Bps) place the jumper in the divide by 4
mode (silk-screen DIV4).
DIV1
DIV4
Figure 7 - Clocking Mode ‘Divide By 4’